Description
A critical remote code execution (RCE) vulnerability, identified as CVE-2025-3248, has been discovered in Langflow versions before 1.3.0. This vulnerability arises from improper handling of user-supplied code in the /api/v1/validate/code endpoint, where Python’s built-in exec() function is invoked without adequate authentication or sandboxing. As a result, unauthenticated attackers can send crafted HTTP requests to execute arbitrary code on the server.
The vulnerability has been actively exploited in the wild, prompting the Cybersecurity and Infrastructure Security Agency (CISA) to add it to its Known Exploited Vulnerabilities (KEV) catalog.
Impact
Exploitation of this vulnerability allows attackers to gain full control of affected Langflow servers without authentication. Potential consequences include:
- System Compromise: Attackers can execute arbitrary commands, leading to complete system takeover.
- Data Exfiltration: Sensitive information may be accessed or stolen.
- Deployment of Malware: Attackers can install malicious software, including crypto miners or backdoors.
- Lateral Movement: Compromised systems can serve as a pivot point for attacks on other network resources.
Given Langflow’s widespread use in AI development workflows, the risk of widespread impact is significant.
Recommendations
To mitigate the risks associated with CVE-2025-3248, immediate action is advised:
- Upgrade Langflow: Update to version 1.3.0 or later, where the vulnerability has been addressed by requiring authentication for the affected endpoint.
- Restrict Access: If immediate upgrading is not feasible, limit exposure by placing Langflow behind a firewall, VPN, or authenticated reverse proxy to prevent unauthorized access.
- Monitor Systems: Implement monitoring to detect unusual activities, such as unexpected outbound connections or the creation of unauthorized files.
- Review AI Workflows: Assess your AI development pipelines for similar vulnerabilities, especially those involving code execution or validation features.
- Stay Informed: Keep abreast of updates from Langflow and cybersecurity authorities to ensure timely application of security patches and recommendations.
Reference
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Threat Advisory
Team Accorian
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